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Regulation of gene expression by viral vectors is an effective method for researchers to explore the function of gene products in a target tissue. The choroid plexus (CP) is an important target for gene therapy of neuropsychiatric diseases such as Alzheimer's disease and major depressive disorder. However, viral tropism in CP has not been well studied as a result of limited viral vector applications. To identify CP-specific viral vectors, we intracerebroventricularly administered six different serotypes of adeno-associated virus (AAV) vectors (AAV2/1, AAV2/5, AAV2/8, AAV2/9, AAV2-BR1, and AAV2-PHP.eB) and lentivirus in adult mice. Tropism in CP was compared among these viruses. We found that AAV2/5 and AAV2/8 displayed remarkable infections in CP, while AAV2/1 infected both ependymal cells and cells in the CP. Except for the low infection intensity of AAV2/9 and lentivirus in the CP, no infection intensity was found for CP tissues injected with AAV2-BR1 or AAV2-PHP.eB. Green fluorescence protein expression in the CP after AAV2/5 infection was confirmed by Western blotting. AAV2/5-mediated tropism in epithelial cells of the CP was verified by immunostaining with transthyretin. In this study, we identified for the first time that serotype-specific AAVs 5 and 8 may be robust research tools for intracerebroventricular gene delivery.

Different Serotypes of Adeno-Associated Virus Vector- and Lentivirus-Mediated Tropism in Choroid Plexus by Intracerebroventricular Delivery